Its not exactly base size- but it is a pretty good measurement. Witch Aelves are pretty universally (from what I can tell) regarded as a very expensive unit and they are 60 USD for 10 32mm models. Can you imagine if these are 100 USD for 10 32mm models?
Whether the price is determined by base size, sprues, perceived value, or the price of tea in China who knows. But you can usually look at the base size and figure out approximately what the cost will be. I don't know if sprues and perceived value play into base size or vice versa, but the fact remains.
I suppose we will find out soon, but its an interesting discussion to have in the meantime haha.